require 'digest/sha1'
class Friend < ActiveRecord::Base 
  has_many :friendships,
    :foreign_key =>       'friend_id',
    :class_name =>        'Friendship'
  has_many :dneirfships,
    :foreign_key =>       'dneirf_id',
    :class_name =>        'Friendship'

  has_many :friends,
    :through => :friendships,
    :source =>  :dneirf
  has_many :dneirfs, 
    :through => :dneirfships,
    :source => :friend

  has_many :pages 
  has_many :notes
  has_many :dojos, :class_name => 'Dojo', :foreign_key => 'doer_id'
  #has_many :dos, :class_name => 'Dojo', :foreign_key => 'doer_id'

  has_one :face, :as => :resource, :dependent => :destroy
  include Drag

  before_create :make_activation_code 

  # Virtual attribute for the unencrypted password
  attr_accessor :password

  serialize :domains

  validates_presence_of     :login, :email
  validates_presence_of     :password,                   :if => :password_required?
  validates_presence_of     :password_confirmation,      :if => :password_required?
  validates_length_of       :password, :within => 4..40, :if => :password_required?
  validates_confirmation_of :password,                   :if => :password_required?
  validates_length_of       :login,    :within => 3..40
  validates_length_of       :email,    :within => 3..100
  validates_uniqueness_of   :login, :email, :case_sensitive => false
  before_save :encrypt_password

  # Authenticates a user by their login name and unencrypted password.  Returns the user or nil.
  def self.authenticate(login, password)
    # hide records with a nil activated_at
    u = find :first, :conditions => ['login = ? and activated_at IS NOT NULL', login]
    u && u.authenticated?(password) ? u : nil
  end

  # Activates the user in the database.
  def activate
    @activated = true
    update_attributes(:domains => {:friend => 1}, :activated_at => Time.now.utc, :activation_code => nil)
  end

  # Returns true if the user has just been activated.
  def recently_activated?
    @activated
  end


  # Encrypts some data with the salt.
  def self.encrypt(password, salt)
    Digest::SHA1.hexdigest("--#{salt}--#{password}--")
  end

  # Encrypts the password with the user salt
  def encrypt(password)
    self.class.encrypt(password, salt)
  end

  def authenticated?(password)
    crypted_password == encrypt(password)
  end

  def remember_token?
    remember_token_expires_at && Time.now.utc < remember_token_expires_at 
  end

  # These create and unset the fields required for remembering users between browser closes
  def remember_me
    self.remember_token_expires_at = 2.weeks.from_now.utc
    self.remember_token            = encrypt("#{email}--#{remember_token_expires_at}")
    save(false)
  end

  def forget_me
    self.remember_token_expires_at = nil
    self.remember_token            = nil
    save(false)
  end

  #domain manager
  def in_domains?(*domains)
    domains.collect{|domain| in_domain? domain }
  end

  def in_domain?(domain) 
    if self.domains
      domain.downcase! if domain.is_a? String
      self.domains.member? domain.to_sym   
    else
      false
    end
  end

  def add_domain(domain)
    self.domains << domain.downcase!
  end


  def self.mindlist(page)
    paginate :per_page => 12, 
             :page => page,
             :conditions => "activated_at is not NULL",
             :order => 'created_at desc'
  end

  def has_familyfriend?(familyfriend)
   begin
    Friendship.find(:first, :conditions => {:dneirf_id => familyfriend, :friend_id => id})
   rescue
    nil
   end
  end

  protected
    # before filter 
    def encrypt_password
      return if password.blank?
      self.salt = Digest::SHA1.hexdigest("--#{Time.now.to_s}--#{login}--") if new_record?
      self.crypted_password = encrypt(password)
    end
    
    def password_required?
      crypted_password.blank? || !password.blank?
    end

    #before_create
    def make_activation_code
      self.activation_code = Digest::SHA1.hexdigest( Time.now.to_s.split(//).sort_by {rand}.join )
    end

end
